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The Boromo Greenstone Belt is part of the prolific Paleoproterozoic (Birimian) greenstone belts of the West African craton. It trends roughly north to northeast from the southernmost border of the country through to central Burkina Faso, over about 400km length. It extends into northwestern Ghana, where it is known as the Wa-Lawra belt. Lithologies in the belt are dominated by mafic to intermediate lavas, tuffs and volcanoclastic sediments, which have in places been intruded by dioritic and gabbroic stocks.

The Boromo greentone belt hosts a large number of significant gold and base metal deposits. This includes the Poura gold deposit, the Bonga lateritic nickel occurrence and the Perkoa volcanogenic zinc massive sulphide deposit. The Poura underground gold mine, the first industrial gold exploitation in the country, produced in excess of 0.7million ounces of gold until its closure in the late 1990s. AIM Resources is currently developing the Perkoa zinc VMS deposit in the northern half of the belt, with a JORC compliant reserve of 6.3Mt at 14.5% zinc. Recent work by Azumah Resources Ltd at their Kunche Deposit, in the Ghanaian branch of the belt, has returned positive results with a recent resource reported of 8.5Mt grading 1.9g/t Au for 516Kozs Au.

The Boromo belt is presently the scene of intensive mineral exploration carried out by a multitude of foreign and local companies.